A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

Ms Miller's latest controversy involves her reportedly last year urging Ipswich's Deputy Mayor Victor Attwood to overthrow Mayor Paul Pisasale, telling him the mayor would "end up in jail".

"I think the time has come for this premier to act against this police minister and the latest revelations today against a very, very well respected public official is the last straw," Opposition Leader Lawrence Springborg told parliament on Friday.

When Ms Miller reportedly had the conversation, Mr Pisasale was being investigated by the Crime and Corruption Commission (CCC) - he was later cleared of wrongdoing - and she was the deputy chair of the Parliamentary Crime and Corruption Commission.

Ms Miller has denied the conversation took place at all, despite Mr Attwood and Mr Pisasale signing sworn affidavits about the incident, the Queensland Times reports.

"We have a police minister that is constantly bumbling, that is stumbling, that is becoming a cloud over the Palaszczuk administration in Queensland," Mr Springborg said.

Ms Miller has come under fire over a string of bungles, including allegedly leaving documents about CCC investigations and the password to a secure online portal in a safe handed to opposition MP Ann Leahy.

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She's also copped flak over Police Commissioner Ian Stewart's early announcement of the relocation of Ipswich's police communications centre, which the government later put on hold to allow time for consultation.

Ms Miller also had to apologise for an "error of judgment" in ringing a man who made allegations of forgery and harassment against first-term Labor MP Rick Williams.